NOT EXISTS SQL To DAX

[Emmy66]

Hi, I have this SQL query which I want to convert to dax as per below. The aim to get data in flowAction where there are no matching records in CaseMassage.

select *
from flowAction f
WHERE NOT EXITS (
Select Null
from CaseMessage l
where l.flowActionID = f.id)

Any help on this will be appreciated. Thanks in advance.

[Greg_Deckler]

@Emmy66 Maybe try using RELATED and ISBLANK? 

Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.